Quiz - Properties of Water

The instrument shown here is called a refractometer. You would use this to determine:

• The temperature of a water sample
• The turbidity of a water sample
• The salinity of a water sample
• The nutrient levels of a water sample

The deep ocean has a constant temperature of around

• 0°C
• 2°C
• 10°C

The waters around the Bahamas have very clear water (and also swimming pigs!) Which is true?

• the water has high levels of phytoplankton and bacteria
• the water has low levels of phytoplankton and bacteria

The thermocline is

• an ocean layer where rapid change in temperature occurs
• an ocean layer where rapid change in salinity occurs
• an ocean layer where rapid change in density occurs

The water of the Amazon River has a

• low turbidity
• high turbidity

A water molecule is held together by

• 1 hydrogen bond
• 2 hydrogen bonds
• 1 covalent bond
• 2 covalent bonds

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Water freezes at 0℃. However, saltwater has a slightly lower freezing point of around -1.8℃. In Fahrenheit, how many degrees lower is the saltwater freezing point than the freshwater freezing point?

• approximately 1 degree lower
• approximately 3 degrees lower
• approximately 5 degrees lower

Which of the following would INCREASE salinity in a location?

• runoff from land
• ice melting
• heavy rainfall
• evaporation

Water is the only substance that naturally exists in all three phases on Earth: gas, liquid, and solid.

• True
• False